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Intel has been making CPUs with integrated GPUs for ages, i7-6700K with UHD630 graphics for example, the thing is they contain a very small number of shaders, etc, because there is only so much real-estate on a single die and these weren’t really intended for gaming, just providing enough GPU for a basic display, watch videos, etc.
I don’t know how well it would work on a tablet, but I’ve got a laptop with a touchscreen and it functions very well with Ubuntu-Mate.